IMO trackpad was the best upgrade Blackberry ever had.
Considering the experience gathered by hardware companys in touch devices, touchtrack is a very well tought idea.
The way touchtrack is built really helps to be a durable component of your blackberry because touchtrack isn't like a touch screen but more a optical mouse turned upside down.Optical mouses are very resistant (i talk by my self :P ) and work even in the most dirtier desks, same happens with touchtrack
